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Discontinued Operations (Tables)
3 Months Ended
Mar. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Discontinued Operations in Income Statement
A summary of the components of discontinued operations in Alliant Energy’s income statements for the three months ended March 31 was as follows (in millions):
 
2016
Operating expenses

$1.9

Loss before income taxes
(1.9
)
Income tax benefit
(0.8
)
Loss from discontinued operations, net of tax

($1.1
)